Slow magnetic relaxations in a ladder-type Dy(III) complex and its dinuclear analogue

Boca, R. ; Stolárová, M. ; Falvello, L.R. (Universidad de Zaragoza) ; Tomás, M. ; Titiš, J. ; Cernák, J.

Resumen: The complex {[Dy2(PDOA)3(H2O)6]·2H2O}n (1) (H2PDOA = 1, 2-phenylenedioxydiacetic acid) was prepared from aqueous solution. Its crystal structure, built up of {-Dy-O-C-O-}n chains interlinked by PDOA ligands yielding a ladder-like arrangement, was determined at 173 K. 1 exhibits slow magnetic relaxation under a small magnetic field BDC = 0.2 T with two (LF and HF) relaxation channels. The LF relaxation time at BDC = 0.2 T and T = 1.85 K is as slow as t(LF) = 46 ms whereas the HF channel is t(HF) = 1.4 ms. The mole fraction of the LF species is xLF = 0.76 at 1.85 K and it escapes progressively on heating. In the dinuclear analogue [Dy2(PDOA)3(H2O)6]·3.5H2O (2) one PDOA ligand forms a bis(chelate) bridge between the two Dy(iii) atoms yielding a local structure analogous to that in 1; however its AC susceptibility data show slightly different quantitative characteristics of the single-molecule magnetic behaviour.

Idioma: Inglés

DOI: 10.1039/c7dt00069c

Año: 2017

Publicado en: Dalton Transactions 46, 16 (2017), 5344-5351
ISSN: 1477-9226

Factor impacto JCR: 4.099 (2017)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 6 / 45 = 0.133 (2017) - Q1 - T1

Factor impacto SCIMAGO: 1.306 - Inorganic Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/M4
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68200-C2-1-P

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)